A while ago Electronic Arts released the older Command and Conquer games for download but since then they have revamped their website and the links seem to have been lost, as of posting below are working links:
Command and Conquer: Gold | Command and Conquer: Gold – GDI ISO Command and Conquer: Gold – NOD ISO |
Command and Conquer: Red Alert | Command and Conquer: Red Alert – Allied Command and Conquer: Red Alert – Soviet |
Command and Conquer: Tiberian Sun | Command and Conquer: Tiberian Sun |